Well-insulated ducts operate at steady state with parameters as shown. The pressure is about 1 atm everywhere. Ignore potential and kinetic energy effects, take the dead state as 14.7 psi and 540°R, and assume ideal gas model for air with c, = 0.24 Btu/lb.°R. 2. I What are the mass flow rates for each state (1, 2, and 3), in lb/min? i What is the exit temperature, T3, in °F? 0] Find the rate of entropy production within the duct, in Btu/min-°R. a. b. c. d. Find the rate of exergy destruction within the duct during this process, in Btu/min. D = 4 ft V = 400 ft/min T = 80°F 3 V3 = 400 ft/min T3 = ? D3 = ? 2 (AV), = 2000 ft/min Vz = 600 ft/min T = 40°F Insulation Page 2 of 3

Elements Of Electromagnetics
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Thermodynamics
2.
Well-insulated ducts operate at steady state with parameters as shown. The pressure is about 1
atm everywhere. Ignore potential and kinetic energy effects, take the dead state as 14.7 psi and
540°R, and assume ideal gas model for air with c, = 0.24 Btu/lb.°R.
a.
0I What are the mass flow rates for each state (1, 2, and 3), in lb/min?
b.
What is the exit temperature, T3, in °F?
0] Find the rate of entropy production within the duct, in Btu/min-°R.
d. Find the rate of exergy destruction within the duct during this process, in Btu/min.
C.
D = 4 ft
V = 400 ft/min
T = 80°F
V3 = 400 ft/min
T3 = ?
D3 = ?
Insulation
(AV), = 2000 ft³/min
V, = 600 ft/min
T, = 40°F
Page 2 of 3
Transcribed Image Text:2. Well-insulated ducts operate at steady state with parameters as shown. The pressure is about 1 atm everywhere. Ignore potential and kinetic energy effects, take the dead state as 14.7 psi and 540°R, and assume ideal gas model for air with c, = 0.24 Btu/lb.°R. a. 0I What are the mass flow rates for each state (1, 2, and 3), in lb/min? b. What is the exit temperature, T3, in °F? 0] Find the rate of entropy production within the duct, in Btu/min-°R. d. Find the rate of exergy destruction within the duct during this process, in Btu/min. C. D = 4 ft V = 400 ft/min T = 80°F V3 = 400 ft/min T3 = ? D3 = ? Insulation (AV), = 2000 ft³/min V, = 600 ft/min T, = 40°F Page 2 of 3
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